.flex{
  display: flex;
}

.letf{
  float: left;
}
.rigth{
  float: right;
}
.flex_centenr{
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.menuBG{
  background-color: rgb(50,65,87);
}

.centenr{
  text-align: center;
}